No idea
According to the FOV calc, you should use 100,39 for 16:10 resolutions, and 106.27 for 16:9 resolutions, fov 90 is "accurate" only for 4:3 screen. fov for 16:10 resolutions (i.e. 1440×900, 1680×1050 and 1920×1200) should be 100.39 and for 16:9 (1920×1080) 106.27. 4:3 (800x600, 1024x800, 1280x960)
This game is Hor+, dependant on your cg_fov settings.( Hor +, or horizontal plus, refers to a behavior specific to certain games that support both 4:3 resolutions and widescreen resolutions. A hor + game is a game that when played on a widescreen monitor with a widescreen resolution, expands the horizontal component of the FOV while keeping the vertical component roughly or exactly the same. This is often considered the ideal solution for widescreen games, as it grants widescreen users a wider picture. )
The game's aspect ratio automatically matches your resolution. But the wider your aspect ratio, the higher cg_fov needs to be to maintain hor +
